(a) After the action of the commissioners of appraisement, as provided in Sections 57.261-57.270 of this code, their final findings, judgment and decree assessing benefits, until changed or modified, shall form the basis of taxation for the district, for all purposes for which taxes may be levied by the district.
(b) Taxes shall be apportioned and levied on each tract of land, railroad, and other real property in the district in proportion to the benefits to the property named in the decree of the commissioners of appraisement.